The C-1S23U-20 from Teledyne Microwave Solutions is a RF & Microwave Circulator with Frequency 1.2 to 1.6 GHz, Average Power Forward 50 W, Peak Power 1000 W, Insertion Loss 0.5 dB, Isolation 17 dB. Tags: Coaxial Circulator. More details for C-1S23U-20 can be seen below.